甘肃北山成矿带白头山地球化学特征研究

发布时间：2018-10-07 19:17

【摘要】：三稀元素是现代重要的资源,可以应用到航空、航天、电子科技等高科技领域,因此研究稀土、分散和稀有元素矿床是十分有意义的。论文以白头山铷矿为研究对象,通过对元素含量特征、元素带出带入规律以及地球化学异常规律等方面的研究,确定矿体直接指示元素为Rb,间接指示元素为Tl、Ga、Be、 Bi、Na2O、K2O。同时,对矿体、蚀变带和围岩中的矿物成分进行研究,确定了成矿元素Rb的载体矿物为钾长石和白云母,矿石中的特征矿物组合为钾长石、白云母、石英、斜长石、少量黑云母和少量石榴子石。蚀变带中的特征矿物组合为黑云母、角闪石、斜长石、石英和钾长石。围岩中的特征矿物组合为斜长石、黑云母、石英、角闪石和钾长石。在此基础上,研究了白头山铷矿的表生异常特征,通过1：1万土壤测量结果和1：5万土壤测量结果,得出在表生环境中白头山铷矿的特征元素组合。在1：1万的土壤测量研究中,确定了大比例尺表生环境中对矿床具有指示意义的元素组合为Rb、T1、Be、Al2O3,、Li、Ga、F, La、在1：5万的土壤测量研究中,确定了中小比例尺表生环境中对矿床具有指示意义的元素组合为Rb、TK、K2O、Be、Ga、Bi。可以看出,表生环境下形成的特征元素组合对原生异常研究所得到的元素组合具有较好的继承性,从而得到白头山铷矿床的勘察地球化学指标,即白头山铷矿床的特征元素组合为Rb、Tl、Ga、Be、 Bi、 K2O,并提出白头山铷矿异常结构模式,为确定北山地区寻找以铷为主稀有金属矿床提供了地球化学找矿标志也为化探方法技术提供了基础依据。
[Abstract]:Three dilute elements are important resources in modern times, which can be applied to the fields of aviation, aerospace, electronic science and technology, etc. Therefore, it is of great significance to study rare earth, dispersed and rare element deposits. This paper takes Baitoushan rubidium ore as the research object, through the study of the element content characteristics, the law of the bringing out of elements and the regularity of geochemical anomaly, it is determined that the direct indicator element of orebody is Rb, indirect indicator element is Tl,Ga,Be, Bi,Na2O,K2O.. At the same time, the mineral composition in orebody, alteration zone and surrounding rock is studied. It is determined that the carrier minerals of Rb are potash feldspar and Muscovite, and the characteristic mineral assemblage of ore is potassium feldspar, Muscovite, quartz, plagioclase. A small amount of biotite and a small amount of pomegranate. The typical mineral assemblages in the altered zone are biotite, hornblende, plagioclase, quartz and potassium feldspar. The characteristic mineral assemblages in surrounding rock are plagioclase biotite quartz hornblende and potassium feldspar. On the basis of this, the supergene anomaly characteristics of Baitoushan rubidium ore are studied. The characteristic element assemblages of Baitoushan rubidium ore in the supergene environment are obtained by the results of 1: 10 000 soil measurements and 1: 50 000 soil measurements. In the soil survey study of 1: 10, 000, it was determined that the element assemblage of large scale epigenetic environment that is indicative to the deposit is Rb,T1,Be,Al2O3,,Li,Ga,F, La, in the soil survey of 1: 50, 000. It is determined that the element assemblage of small and medium scale epigenetic environment which has indicative significance to the deposit is Rb,TK,K2O,Be,Ga,Bi.. It can be seen that the characteristic element assemblage formed in the supergene environment has a good inheritance to the element assemblage obtained from the primary anomaly study, and the geochemical index of the Baitoushan rubidium deposit is obtained. That is, the characteristic element assemblage of Baitoushan rubidium deposit is Rb,Tl,Ga,Be, Bi, K _ 2O, and the anomalous structural model of Baitoushan rubidium deposit is proposed. This paper provides geochemical prospecting markers for the determination of rubidium-based rare metal deposits in Beishan area and provides a basis for geochemical exploration methods and techniques.
【学位授予单位】：中国地质科学院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.77

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